Image Registration, Segmentation and Virtual Simulation
Vibeke N. Hansen, J.-C. Rosenwald · 2021
In the three previous chapters, the main imaging modalities for external radiotherapy treatment planning have been introduced. Computed tomography (CT) imaging is the most commonly used method for patient data acquisition. It provides the information for the electron density, which is required for the dose calculation of the planning process. However, frequently, several imaging modalities are combined to allow better delineation of target volumes and organs at risk according to the specifications given in Chapter 31. This requires some form of three-dimensional (3D) registration between these modalities The methods for performing image registration resulting in a multimodality 3D image dataset are described in Section 35.2. The process consisting of the extraction of specific anatomic structures from this dataset is called segmentation ; it is addressed in Section 35.3.